basic functionality, just need to draw characters

1 files changed, 104 insertions, 0 deletions

diff --git a/banner.c b/banner.c
new file mode 100644
index 0000000..4e43f0b
--- /dev/null
+++ b/banner.c
@@ -0,0 +1,104 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2022, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/* TODO: Track down XPG/3 or 4 to get a more accurate description of requirements */
+
+#define _POSIX_C_SOURCE 2
+#include <ctype.h>
+#include <limits.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define CHARACTER_WIDTH		9
+#define CHARACTER_HEIGHT	8
+
+static char letters[UCHAR_MAX][CHARACTER_HEIGHT][CHARACTER_WIDTH] = {
+	['a'] =	{ "        ",
+		  "        ",
+		  "  aaa   ",
+		  "     a  ",
+		  "  aaaa  ",
+		  " a   a  ",
+		  "  aaa a ",
+		  "        ", },
+
+	['b'] =	{ "        ",
+		  " b      ",
+		  " b      ",
+		  " b      ",
+		  " bbbbb  ",
+		  " b    b ",
+		  " bbbbb  ",
+		  "        " },
+
+};
+
+static void banner(char *s, size_t columns)
+{
+	size_t slen = strlen(s);
+	for (size_t i = 0; i < slen; i++) {
+		if (!isprint(s[i]) || s[i] < 0 || i > UCHAR_MAX) {
+			s[i] = '?';
+		}
+	}
+
+	for (size_t row = 0; row < CHARACTER_HEIGHT; row++) {
+		for (size_t i = 0; i < columns / CHARACTER_WIDTH && i < slen; i++) {
+			fputs(letters[(size_t)s[i]][row], stdout);
+		}
+		putchar('\n');
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+
+	int c;
+	while ((c = getopt(argc, argv, "")) != -1) {
+		switch(c) {
+		default:
+			return 1;
+		}
+	}
+
+	if (optind >= argc) {
+		fprintf(stderr, "banner: missing operands\n");
+		return 1;
+	}
+
+	size_t columns = 80;
+	char *colenv = getenv("COLUMNS");
+	if (colenv) {
+		columns = atoi(colenv);
+	}
+
+	while (optind < argc) {
+		banner(argv[optind++], columns);
+	}
+	return 0;
+}